Actions for Room temperature deformation mechanisms of alumina particles observed from in situ micro-compression and atomistic simulations [electronic resource].

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Room temperature deformation mechanisms of alumina particles observed from in situ micro-compression and atomistic simulations [electronic resource].

Published
Washington, D.C. : United States. National Nuclear Security Administration, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
pages 82-93 : digital, PDF file
Additional Creators
Sandia National Laboratories, United States. National Nuclear Security Administration, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Aerosol deposition (AD) is a solid-state deposition technology that has been developed to fabricate ceramic coatings nominally at room temperature. Sub-micron ceramic particles accelerated by pressurized gas impact, deform, and consolidate on substrates under vacuum. Ceramic particle consolidation in AD coatings is highly dependent on particle deformation and bonding; these behaviors are not well understood. In this work, atomistic simulations and in situ micro-compressions in the scanning electron microscope, and the transmission electron microscope (TEM) were utilized to investigate fundamental mechanisms responsible for plastic deformation/fracture of particles under applied compression. Results showed that highly defective micron-sized alumina particles, initially containing numerous dislocations or a grain boundary, exhibited no observable shape change before fracture/fragmentation. Simulations and experimental results indicated that particles containing a grain boundary only accommodate low strain energy per unit volume before crack nucleation and propagation. In contrast, nearly defect-free, sub-micron, single crystal alumina particles exhibited plastic deformation and fracture without fragmentation. Dislocation nucleation/motion, significant plastic deformation, and shape change were observed. Simulation and TEM in situ micro-compression results indicated that nearly defect-free particles accommodate high strain energy per unit volume associated with dislocation plasticity before fracture. As a result, the identified deformation mechanisms provide insight into feedstock design for AD.
Report Numbers
E 1.99:sand--2015-7094j
sand--2015-7094j
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
09/22/2015.
"sand--2015-7094j"
"603168"
Journal of Thermal Spray Technology 25 1-2 ISSN 1059-9630 AM
Pylin Sarobol; Michael E. Chandross; Jay D. Carroll; William M. Mook; Daniel Charles Bufford; Brad L. Boyce; Khalid Mikhiel Hattar; Paul G. Kotula; Aaron Christopher Hall.
Funding Information
AC04-94AL85000
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